Candussio, S. and Golub, L. E. and Bernreuter, S. and Joetten, T. and Rockinger, T. and Watanabe, K. and Taniguchi, T. and Eroms, J. and Weiss, D. and Ganichev, S. D. (2021) Nonlinear intensity dependence of edge photocurrents in graphene induced by terahertz radiation. PHYSICAL REVIEW B, 104 (15): 155404. ISSN 2469-9950, 2469-9969
Full text not available from this repository.Abstract
We report on the observation of terahertz-radiation-induced edge photogalvanic currents in graphene, which are nonlinear in intensity. The increase of the radiation intensities up to MW/cm(2) results in a complex nonlinear intensity dependence of the photocurrent. The nonlinearity is controlled by the back gate voltage, temperature, and radiation frequency. A microscopic theory of the nonlinear edge photocurrent is developed. Comparison of the experimental data and theory demonstrates that the nonlinearity of the photocurrent is caused by the interplay of two mechanisms, i.e., by direct interband optical transitions and Drude-like absorption. Both photocurrents saturate at high intensities but have different intensity dependencies and saturation intensities. The total photocurrent shows a complex sign-alternating intensity dependence. The functional behavior of the saturation intensities and amplitudes of both kinds of photogalvanic currents, depending on gate voltages, temperature, radiation frequency, and polarization, is in good agreement with the developed theory.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | PHOTON DRAG; ABSORPTION; TRANSPORT |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics > Professor Ganichev > Group Sergey Ganichev Physics > Institute of Experimental and Applied Physics > Chair Professor Weiss > Group Dieter Weiss Physics > Institute of Experimental and Applied Physics > Chair Professor Weiss > Group Jonathan Eroms |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 18 Aug 2022 10:27 |
| Last Modified: | 18 Aug 2022 10:27 |
| URI: | https://pred.uni-regensburg.de/id/eprint/46751 |
Actions (login required)
 |
View Item |
